Retaining vector elements

Hello,
I have 2 jsps. 1.jsp has a link to 2.jsp. 2.jsp has list of products from database. The user selects the product with the checkbox. I am getting the products that are checked for the first time and I am displaying them on 1.jsp. When the user wants to add more products, I am loosing the product list that he had selected before.
The following code is in 1.jsp. I think my problem is I am initializing vector each time user goes to 1.jsp.
I was wondering if anyone could guide me with this issue. I just want to retain all the selected products in one vector.
Vector vprod_id = new Vector();
arrId = request.getParameterValues("prodid");
     if(arrId != null)
     for(int i = 0; i < arrId.length; i++)
          vprod_id.addElement(new Integer(arrId));
     out.println(vprod_id.elementAt(i));
     else
          out.println("No Products Selected");

Keep the vector in a session attribute.
ie
session.setAttribute("productList", vprod_id);
session.getAttribute("productList");This will retain it between html pages.

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Copy vector elements to array

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to copy the 2 elements in aList vector to my name[1]?

if i create a vector called aList,
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String[5];
how to use this method
copyInto(Object[] anArray)
Copies the components of this vector into
ctor into the specified array.
to copy the 2 elements in aList vector to my name[1]?A confusing question: you want to put two Vector elements into one array element? Can't put ten pounds of @%^@%^@^ in a five pound bag, can you?
If you really want two Vector elements to be stored in one array element you'll have to combine them in some way. String concatenation will do.
If you mean you'd like to copy all the Vector elements into the array, you'll have to do something like this:
Vector aList = new Vector();
// add some elements to aList
int numNames = aList.size();
String [] names = new String[numNames];
for (int i = 0; i < numNames; ++i)
names[i] = (String)aList.get(i);MOD

If I'm copying text and/or vector elements from Indesign to Photoshop how come their pixel sizes change even though I opened the same sized document and my indesign file is a web file?

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@rickphot
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Class vElement only cantains an int n, an int[] array.
i create a text file: input.txt
in this text file, there are 2 rows of content:
1 2 3 1001
4 5 6 1002
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I had the same problem. I believe this is because Vector stores references of everything it is added into it. My problem was solved by creating a new array everytime I had to add an element to Vector.
Instead of:
My_vector.addElement(My_array)
I did:
String[ ] Prov_array = new String[My_array.length];
System.arraycopy(My_array,0,Prov_array, 0,My_array.length);
My_vector.addElement(Prov_array);
Might not be the best solution but it solved the problem.

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Version is CS5.
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I have used all of the methods mentioned and the end result is the same. It is starting to look to me like this is a fluke that happened with this particular file and that it is not something that can be duplicated intentionally.

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Thanks for your help,
Wallace

By the way:
- don't use Vectors if you don't have to. Other collections may be better suited and faster.
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Compare newly added Vector Element with all previous

Hi all
I am adding Point2D elements to a vector "Numbers" in such a way that every newly randomly created element that is at a distance of 0.3 from all the previous points is added else not.
I have written a code that only checks from the last element but not all the previous elements.
Can someone check what wrong am I doing.
The code is runnable.
import java.awt.geom.Point2D;
import java.util.*;
public class Distance
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     yCoord = rnd.nextDouble();          // Y coord of AP
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}Thanks a lot

Hi all
I am adding Point2D elements to a vector "Numbers" in such a way that every newly randomly created element that is at a distance of 0.3 from all the previous points is added else not.
I have written a code that only checks from the last element but not all the previous elements.
Can someone check what wrong am I doing.
The code is runnable.
import java.awt.geom.Point2D;
import java.util.*;
public class Distance
     Vector<Point2D> numbers = new Vector<Point2D>();
     Random rnd = new Random();
     void getList()
     double xCoord,yCoord;
     for(int i=0;i<5;i++)// is is the no. of coordinates stored later only "b" to be used
     xCoord = rnd.nextDouble();          // X-coord of AP
     yCoord = rnd.nextDouble();          // Y coord of AP
     if(i<2)
          numbers.addElement(new Point2D.Double(xCoord,yCoord));
          System.out.println("0th n 1st element added : "+i+ "   "+numbers.get(i));
     else
     for(int j=i-1;j>i-2;j--)
          if((numbers.get(j).distance(xCoord,yCoord))>0.3)
               numbers.addElement(new Point2D.Double(xCoord,yCoord));
               System.out.println("next element added : "+i+ "   "+numbers.get(j)+" with distance: "
                         +(numbers.get(j).distance(xCoord,yCoord))+"from "+ xCoord + " "+ yCoord);
     Iterator it = numbers.iterator ();
       while (it.hasNext ())
        System.out.println(it.next());
     public static void main(String[] argv)
          Distance d = new Distance();
          d.getList();
}Thanks a lot

Replacing imported vector elements in After effects CS4

Hello
I have imported a layered illustrator vector file into my composition, dragged individual elements to the working area and applied transitions and effects. I now have the need to make some subtle edits to the original vector files and am wondering the process to auto update these items in the composition. Without having to re edit the composition again, this would be similar to a replace symbol in Flash.
thanks
Matt

That will replace a layer's contents without altering your effects.
You can also use a couple of other trick like editing your Illustrator art, saving it to the same name and overwriting it, and then reloading the file in AE. This populates the project's comps with the new artwork.

Vector element retrieval

Hello,
I am designing a servlet to store the rows in a resultset. The solution that I have come up with is to store all of the elements in the row in an array and then storing the array as an element in a Vector. The user will then choose the index of the Vector which will be the array/row that the user wants to see. I wanted to know of the functionality of the Vector class and the ability that I can have to take the Object from the Vector and treat it as it was when I put it in there.
Basically, I want the array to be converted back into an array from an Obejct so I can then take all of the elements of the array and use them as I please. Do you think that this is possible?

try this....
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Omer

Efficient compare among vector elements

Hi guys,
I've a basic question, I've solved it with lots of nester for and I'm sure it's not the best way to do it, so I hope you can help me.
I've a vector of object User, so Vector<User> and user object has a property age.
What I want is simply:
1) iterating this vector and make comparing of age field for each user with each user (for example, 3 user, user1 - user2, user2 -user3,user3-user1).
2) User older for each compare must be entered in a new vector.
So starting from a vector of n element I should have a new vector with dimension equal to n*(n-1)/2.
Could someone help me to find most efficient code? (please show some code example)
Thanks,
Regards

new_to_java123 wrote:
What I want is simply:
1) iterating this vector and make comparing of age field for each user with each user (for example, 3 user, user1 - user2, user2 -user3,user3-user1).
2) User older for each compare must be entered in a new vector.
So starting from a vector of n element I should have a new vector with dimension equal to n*(n-1)/2.Well what you want is simply a very inefficient way to solve the problem. As you describe it you will use an algorithm of complexity O(n**2), while it can be done in O(n)!
What you should do:
1) Parse the vector once and determine the minAge and maxAge
2) Create an array[min-age, max-age] which contains a list of users for each index. As this is not directly supported in Java, use an ArrayList of size (maxAge - minAge ++1) and populate it with an empty List for each index 0 .. maxAge - minAge. Each entry with index i in that ArrayList is a List of persons whose age is (i ++ minAge).
3) Now iterate over the original Vector and append each user to the List of persons of his age (in code: ageList.get(user.getAge() - minAge()).add(user); )
Voilá. Only two scans of the original Vector and you have a structure that holds
1) List of the users of a given age (ageList.get(age - minAge()).
2) All users older than the given age can be found by iterating the lists with greater index as (age - minAge()).
And of course the memory requirements are much lower also!
It needs to store only maxAge - minAge + 1 plus the outer ageList. if you store null instead of an empty list if no user has a specific age this can be further reduced at the cost of havein to do more null checks.

Retaining vector elements

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